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參數資料
| 型號： | HT48E50 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | I/O Type 8-Bit MTP MCU With EEPROM |
| 中文描述： | I / O型8位微控制器帶有EEPROM中期計劃 |
| 文件頁數： | 18/46頁 |
| 文件大小： | 303K |
| 代理商： | HT48E50 |
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HT48E50
Rev. 0.00
18
September 29, 2004
Preliminary
The I/O functions of PB0/PB1 are shown below.
PB0 I/O
I
I
O
O
O
O
O
O
O
O
PB1 I/O
I
O
I
I
I
O
O
O
O
O
PB0 Mode
x
x
C
B
B
C
B
B
B
B
PB1 Mode
x
C
x
x
x
C
C
C
B
B
PB0 Data
x
x
D
0
1
D
0
0
1
0
1
PB1 Data
x
D
x
x
x
D
1
D
D
x
x
PB0 Pad Status
I
I
D
0
B
D
0
0
B
0
B
PB1 Pad Status
I
D
I
I
I
D
1
D
D
0
B
Note:
I input,
B buzzer option, BZ or BZ,
C CMOS output
O output,
D, D
0
, D
1
data,
x don't care
The PG0 is pin-shared with INT.
It is recommended that unused or not bonded out I/O
linesshouldbesetasoutputpinsbysoftwareinstruction
to avoid consuming power under input floating state.
Low Voltage Reset
LVR
The microcontroller contains a low voltage reset circuit
inordertomonitorthesupplyvoltageofthedevice.Ifthe
supply voltage of the device drops to within a range of
0.9V~V
LVR
, such as might occur when changing the bat-
tery, the LVR will automatically reset the device inter-
nally.
The LVR includes the following specifications:
The low voltage (0.9V~V
LVR
) must exist for greater
than 1ms. If the low voltage state does not exceed
1ms, the LVR will ignore it and do not perform a reset
function.
The LVR uses the OR function with the external
RES signal to perform a chip reset.
TherelationshipbetweenV
DD
andV
LVR
isshownbelow.
Note:
V
OPR
is the voltage range for proper chip opera-
tion at 4MHz system clock.
5 E 5
4 E 4
E 0
E 8
(
5 E 5
5 E 5
(
E 8
" +
$ !
"
F
F
+
#
" $ !
"
(
+
"
" +
"
Low Voltage Reset
Note:
*1. To make sure that the system oscillator has stabilized, the SST provides an extra delay of
1024 system clock pulses before entering the normal operation.
*2. Low voltage has to be maintained for over 1ms, after that 1ms delay the device enters the reset mode.
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